CVE-2026-1637— Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow
Quick assessment
Affected
Tenda AC21
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Tenda AC21是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC21 16.03.08.16版本存在安全漏洞，该漏洞源于文件/goform/AdvSetMacMtuWan中的函数fromAdvSetMacMtuWan存在栈缓冲区溢出。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-1637
Vulnerability Information
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Vulnerability Title
Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function fromAdvSetMacMtuWan of the file /goform/AdvSetMacMtuWan. The manipulation leads to stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Tenda AC21 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda AC21是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC21 16.03.08.16版本存在安全漏洞，该漏洞源于文件/goform/AdvSetMacMtuWan中的函数fromAdvSetMacMtuWan存在栈缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-1637
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Same Patch Batch · Tenda · 2026-01-29 · 3 CVEs total
| CVE-2026-1610 | 8.1 HIGH | Tenda AX12 Pro V2 Telnet Service hard-coded credentials |
| CVE-2026-1638 | 6.3 MEDIUM | Tenda AC21 mDMZSetCfg command injection |
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V. Comments for CVE-2026-1637
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